05000302/LER-1978-023-03, /03L-0:on 780408,radiation Area Monitor RMA-4 Found Intermittently Spiking High.Cause Under Investigation. RMA-15 Put Into Operation to Monitor Spent Fuel Pool Area Gaseous Activity

/03L-0:on 780408,radiation Area Monitor RMA-4 Found Intermittently Spiking High.Cause Under Investigation. RMA-15 Put Into Operation to Monitor Spent Fuel Pool Area Gaseous Activity

ML19319C938
Person / Time
Site:	Crystal River
Issue date:	04/26/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19319C930	List: 05000302/LER-1978-023-03, /03L-0:on 780408,radiation Area Monitor RMA-4 Found Intermittently Spiking High.Cause Under Investigation. RMA-15 Put Into Operation to Monitor Spent Fuel Pool Area Gaseous Activity
References
LER-78-023-03L, LER-78-23-3L, NUDOCS 8003040879
Download: ML19319C938 (2)

LER-1978-023, /03L-0:on 780408,radiation Area Monitor RMA-4 Found Intermittently Spiking High.Cause Under Investigation. RMA-15 Put Into Operation to Monitor Spent Fuel Pool Area Gaseous Activity

Event date:
Report date:
3021978023R03 - NRC Website

text

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,,,,,, At 0600 Radiation Area Mon.cor 4 (RMA-4) intermittently spikiqg i high for no apparent reason.

Sample pump replacement recest t

,,,,,, indicates that condition still exists but occurs less frequentl:

i RM A-15 h a s been put in operation to replace RMA-4.

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SUPPLEMENTARY INFORMATION 1.-

ort No.:

50-302/78-23/0?L-0 2.

ity:

Crystal River Unit #3 3.

Report Date:

26 April 1978 4.

Occurrence Date:

8 April 1978 5.

Identification of Occurrence:

Radiation area monitor 4 inoperable contrary to Tech Spec 3.3.3.1, Table 3.3-6, Item 2(a).

6.

Conditions Prior to Occurrence:

Mode 6 refueling.

7.

Dsccription of Occurrence:

At 0600 on 8 April 1978 Radiation Area Monitor 4 (RMA-4), radiation monitor for the Spent Fuel Storage Pool Area gaseous activity monitor, was inoperable due to sample pump tripping.

Investigation by control technicians revealed that the carbon vane sample pump was binding and tripping motor on overload.

The carbon vane sample pump was replaced on 11 April 1978.

Retest )f sample pump indicates that intermittent tripping still occurs, but is less freluent.

Investigation into cause et tripping is continuing.

As Tech Spec 3.3.3.1, Table 3.3-6, Item 2(a) identifies this Radiation. Monitor as the Fuel Storage Pool Area Gaseous Activity -

(\\p, Ventilation System Isolation Monitor, when in fact RMA-4 does not perform th 4

function. A requesg for Tenh Spec change will be initiated.

During the information search of this report it was also discovered the RMA-4 was inoperable on 31 March 1978.

Further investigation revealed that Operations personnel had reviewed Tech Spec 3.3.3.1, Table 3.3-6, Item 2(a) on 31 March 1978 and determined that RMA-4 would meet the criteria set forth in Tech Specs and RMA-4 inoperability was not a nonconforming operation.

8.

Dctignation of Apparent Cause:

Apparent cause of RMA-4 sample pump tripping is unknown at this ti=e.

9.

Analysis of occurrence:

There is no hazard to the health and safety of the plant or public as final effluent

=onitor RMA-2 is operational.

10.

Corrective Action

RMA-13 was put in operation to monitor spent fuel pool area gaseous activity. Pro-posed Tech Spec change is forthcoming to omic RMA-4 as a required monitor.

Repair of RMA-4 will be accomplished when investigation is complete. Operations personnel have been cautioned by speed letter that any time there is a question as to Tech Spec applicability, a Nonconforming Operation Report will be submitted.

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11. (,kure Data:

Fourth occurrence of sample pump failure; however, this is the first occurrence of RMA-4 f ailure.